http://www.ebay.com/itm/271226451135
These vintage swim trunks were made in the 1930s. They are marked “Guaranteed 100% all wool”. They are belted, with an elasticized belt with zig zag buckle. They have a smell from their old mothproofing, but it seems to have done its job well, I do not see any holes. They are lined in the front.

Waist (unstretched): 14″ (doubled = 28″)
Waist (stretched): 18″ (doubled = 36″)
Side Seam: 9″
Rise: 14″